kenjis

Needs #9139 **Description** See #9116 - add workaround for the error like the following. > ErrorException: Kint\Parser\Parser::__construct(): Implicitly marking parameter $caller as nullable is deprecated, the explicit nullable type must...

**Description** Supersedes #1172 - add `UserModel::createNewUser()` - refactor **Checklist:** - [x] Securely signed commits - [ ] Component(s) with PHPDoc blocks, only if necessary or adds value - [ ]...